:root {
  --bg: #f5f5f7;
  --surface: #ffffff;
  --text: #1d1d1f;
  --secondary: #6e6e73;
  --tertiary: #86868b;
  --line: #d2d2d7;
  --blue: #0071e3;
  --blue-hover: #0077ed;
  --link: #0066cc;
  --nav: rgba(245, 245, 247, 0.8);
  --shadow: 0 30px 80px rgba(0, 0, 0, 0.14), 0 6px 18px rgba(0, 0, 0, 0.06);
  --radius: 28px;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --surface: #1c1c1e;
    --text: #f5f5f7;
    --secondary: #a1a1a6;
    --tertiary: #86868b;
    --line: #38383a;
    --blue: #0a84ff;
    --blue-hover: #409cff;
    --link: #2997ff;
    --nav: rgba(0, 0, 0, 0.72);
    --shadow: 0 30px 80px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(255, 255, 255, 0.06);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", Inter, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.47;
  letter-spacing: -0.022em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Navigation */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--nav);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid color-mix(in srgb, var(--line) 60%, transparent);
}
.nav-inner {
  max-width: 1080px;
  margin: 0 auto;
  height: 52px;
  padding: 0 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 600; font-size: 19px; }
.brand:hover { text-decoration: none; }
.brand img { border-radius: 7px; }
.nav nav { display: flex; align-items: center; gap: 26px; font-size: 14px; }
.nav nav a:not(.pill) { color: var(--text); opacity: 0.8; }
.nav nav a:not(.pill):hover { opacity: 1; text-decoration: none; }

/* Buttons */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--blue);
  color: #fff;
  font-weight: 500;
  font-size: 17px;
  padding: 13px 26px;
  border-radius: 980px;
  transition: background 0.2s ease, transform 0.2s ease;
}
.pill:hover { background: var(--blue-hover); text-decoration: none; }
.pill:active { transform: scale(0.97); }
.pill svg { width: 20px; height: 20px; }
.pill.small { font-size: 13px; padding: 6px 15px; }

/* Hero */
.hero {
  max-width: 900px;
  margin: 0 auto;
  padding: 88px 22px 56px;
  text-align: center;
}
.hero-icon {
  border-radius: 25px;
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.18);
  margin-bottom: 28px;
}
h1 {
  font-size: clamp(38px, 7vw, 80px);
  line-height: 1.05;
  letter-spacing: -0.035em;
  font-weight: 700;
  margin: 0 0 20px;
}
.lead {
  font-size: clamp(19px, 2.4vw, 24px);
  line-height: 1.4;
  color: var(--secondary);
  max-width: 640px;
  margin: 0 auto 34px;
  letter-spacing: -0.01em;
}
.actions { display: flex; justify-content: center; align-items: center; gap: 28px; flex-wrap: wrap; }
.link { font-size: 19px; }
.meta { color: var(--tertiary); font-size: 14px; margin-top: 18px; }

/* Screenshots */
.frame {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  background: #000;
  line-height: 0;
}
.frame img { width: 100%; height: auto; display: block; }
.showcase { max-width: 1080px; margin: 0 auto; padding: 0 22px 120px; }

/* Features */
.features { max-width: 1080px; margin: 0 auto; padding: 0 22px 120px; }
h2 {
  font-size: clamp(32px, 4.5vw, 48px);
  line-height: 1.1;
  letter-spacing: -0.03em;
  font-weight: 700;
  text-align: center;
  margin: 0 0 48px;
}
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card {
  background: var(--surface);
  border-radius: 22px;
  padding: 30px 28px 32px;
}
.card h3 { font-size: 21px; letter-spacing: -0.02em; margin: 18px 0 8px; font-weight: 600; }
.card p { margin: 0; color: var(--secondary); font-size: 16px; }
.glyph {
  width: 48px; height: 48px;
  border-radius: 12px;
  display: grid; place-items: center;
  color: #fff;
}
.glyph svg { width: 26px; height: 26px; }
.blue { background: #0a84ff; } .green { background: #30d158; } .indigo { background: #5e5ce6; }
.orange { background: #ff9f0a; } .pink { background: #ff375f; } .gray { background: #8e8e93; }

.gallery {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 22px 120px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.gallery .frame { border-radius: 20px; }

/* Install */
.install { max-width: 760px; margin: 0 auto; padding: 0 22px 100px; }
.steps { list-style: none; padding: 0; margin: 0 0 40px; display: grid; gap: 14px; }
.steps li {
  display: flex; gap: 20px; align-items: flex-start;
  background: var(--surface);
  border-radius: 22px;
  padding: 24px 26px;
}
.steps span {
  flex: none;
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--blue);
  color: #fff;
  font-weight: 600;
  display: grid; place-items: center;
}
.steps h3 { margin: 4px 0 4px; font-size: 19px; letter-spacing: -0.02em; }
.steps p { margin: 0; color: var(--secondary); font-size: 16px; }

.download-card {
  display: flex; align-items: center; gap: 18px;
  background: var(--surface);
  border-radius: 22px;
  padding: 20px 22px;
}
.download-card img { border-radius: 14px; }
.download-card div { flex: 1; display: flex; flex-direction: column; }
.download-card strong { font-size: 19px; letter-spacing: -0.02em; }
.download-card span { color: var(--secondary); font-size: 15px; }
.checksum { color: var(--tertiary); font-size: 12px; margin: 14px 4px 0; word-break: break-all; }
.checksum code { font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 12px; }

.notes { max-width: 760px; margin: 0 auto; padding: 0 22px 80px; }
.notes p { color: var(--secondary); font-size: 14px; line-height: 1.55; margin: 0; }
.notes strong { color: var(--text); font-weight: 600; }

/* Footer */
footer { border-top: 1px solid var(--line); }
.footer-inner { max-width: 1080px; margin: 0 auto; padding: 28px 22px 44px; font-size: 13px; color: var(--secondary); }
.footer-inner p { margin: 0 0 8px; }
.footer-inner .fine { color: var(--tertiary); font-size: 12px; }

@media (max-width: 860px) {
  .grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .nav nav a:not(.pill) { display: none; }
  .hero { padding-top: 56px; }
  .hero-icon { width: 88px; height: 88px; border-radius: 20px; }
  .grid, .gallery { grid-template-columns: 1fr; }
  .frame { border-radius: 16px; }
  .showcase, .features, .gallery { padding-bottom: 80px; }
  .download-card { flex-wrap: wrap; }
  .download-card .pill { width: 100%; justify-content: center; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .pill { transition: none; }
}